The radius of the disk is R, and the mass of the disk is M. Using the parallel axis theorem and theequation for the moment of inertia of a disk about its central axis developed in the previous example, Eq. (8), the moment of inertia of the disk about the specified axis is Fig.
Short Circuits. Short circuits are the second most common reason for breaker tripping and are a more serious concern. Short circuits occur when the black hot wires inside your electrical service panel come in contact with either other hot wires or neutral wires.
The B+ supply Voltage from early valve rectifier power supplies drops as the output valves warm up and conduct current. Removing the output valves so no current is being taken from the power supply will cause the B+ Voltage to rise close to the academic formula. 360V AC x 1.414 = 509V DC.